Statistically, you are more likely to be hit by lightning, twice at once, than to lose both engines to birds. Any company that put meshes on would go bankrupt due to the inability to compete.

It would never pass an inlet icing test. As soon as you got into an icing condition, the screen would fill with ice, your compressor would stall and you would lose an engine -- probably both engines.

If you poured a huge amount of electric power to the screens (and I mean huge), you may be able to melt the ice, but it would fall off in big chunks and it would go through the engine and sheer the fans.

Icing is a much more common occurrence than ingestion of flocks of birds, and a screen would be a disaster in icing conditions, not to mention a thrust loss of perhaps 3 percent even in perfect conditions due to inlet distortion.

That 3 percent might be what you need to clear the trees at the end of the runway. It's simply not feasible.

And lastly, if your point is saving the bird's life, anything being hit by something in excess of 160 to 200 knots (200 to 230 mph) will certainly not survive.